Mob Spawner won't spawn custom Entity

[Fi0x]

I am generating custom structures and want to set a random spawner type inside them.

That worked fine, until I set the entity to spawn to one of my own entities.

Working code:

logic.setEntityId(new ResourceLocation("Zombie"));

(logic is the MobSpawnerLogic)

 

New code:

logic.setEntityId(new ResourceLocation(Reference.MOD_ID, "Giant"));

The problem is that the spawner block is showing up in the game and the mob rotating inside is the right one, but it won't spawn anything.

 

I used a structure block to get the nbt data from the spawner that was generated and attached it to this post.

nbt_data_via_structure_block.nbt

[Fi0x]

How should I access the entity type instead?

[Fi0x]

I'm currently on 1.12